Some smart Web apps can do things you want if you just send them an email. Be it creating a Web page, setting up a reminder, or even adding a book to your Kindle, there are plenty of tasks possible with just an email.

We are all behind Gmail as the best email client, but the beauty of these email-based services is that they work across any email address, any client, any browser, and any platform. Some of them may need you to sign up in advance, but once that's done, they are ready to go.